<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>hash 实现前端路由</title>

    <style>

        #nav {
            margin: 0;
            border: 0;
            height: 40px;
            border-top: #060 2px solid;
            margin-top: 10px;
            border-bottom: #060 2px solid;
            background-color: red;
        }

        #nav ul {
            margin: 0;
            border: 0;
            list-style: none;
            line-height: 40px;
        }

        #nav li {
            display: block;
            float: left;
        }

        #nav a {
            display: block;
            color: #fff;
            text-decoration: none;
            padding: 0 20px;
        }

        #nav a:hover {
            background-color: orange;
        }

    </style>
</head>

<body>

<h3>使用 hash 实现前端路由</h3>
<hr/>
<a href="#hash1">#hash1</a>
<a href="#hash2">#hash2</a>
<a href="#hash3">#hash3</a>
<a href="#hash4">#hash4</a>

<p/>
<div id="show-hash-result" style="color:blue">
    点击上面链接，并观察浏览器
</div>
<h4>定义一个简单的 tab 路由页面</h4>
<div id="nav">
    <ul>
        <li><a href="#/index.html">首页</a></li>
        <li><a href="#/server">服务</a></li>
        <li><a href="#/mine">我的</a></li>
    </ul>
</div>
<div id="result"></div>

<script type="text/javascript">
    window.addEventListener("hashchange", function () {
        //变化后输出当前地址栏中的值
        document.getElementById("show-hash-result").innerHTML = "当前的 hash 值是:  " + location.hash;
        //打印出当前 hash 值
        console.log("当前的 hash 值是:" + window.location.hash);
    });
</script>

<!-- 定义 router 的 js 代码块 -->
<script type="text/javascript">
    //自定义一个路由规则
    function CustomRouter() {
        this.routes = {};
        this.curUrl = '';

        this.route = function (path, callback) {
            this.routes[path] = callback || function () {
            };
        };

        this.refresh = function () {
            if (location.hash.length != 0) { // 如果 hash 存在
                this.curUrl = location.hash.slice(1) || '/';
                if (this.curUrl.indexOf('/') != -1) { //这里粗略的把 hash 过滤掉
                    this.routes[this.curUrl]();
                }
            }
        };

        this.init = function () {
            window.addEventListener('load', this.refresh.bind(this), false);
            window.addEventListener('hashchange', this.refresh.bind(this), false);
        }
    }

    //使用路由规则
    var R = new CustomRouter();
    R.init();
    var res = document.getElementById('result');

    R.route('/hash1', function () {
        document.getElementById("show-hash-result").innerHTML = location.hash;
    })

    R.route('/index.html', function () {
        res.style.height = '150px';
        res.style.width = '300px';
        res.style.background = 'green';
        res.innerHTML = '<html>我是首页</html>';
    });

    R.route('/server', function () {
        res.style.height = '150px';
        res.style.width = '300px';
        res.style.background = 'orange';
        res.innerHTML = '我是服务页面';
    });
    R.route('/mine', function () {
        res.style.background = 'red';
        res.style.height = '150px';
        res.style.width = '300px';
        res.innerHTML = '我的界面';
    });

</script>
</body>
</html>
